Hello

int the example below the problem is reproducible raughly 1 of 5 tries. On our production happends as well in similar perid (In google chrome)

I'm not sure if it has something to do with component columns or not

when I close the window (top right 'x'), the javacript error appear
I put as well screenshot of that js error (sooner you click 'x' more likelly it will appear

seems like onLoad of all comboboxes is not called quick enough or so (and window is destroyed in the meantime)

Code:
<%@ Page Language="C#" %>

<script runat="server">
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!X.IsAjaxRequest)
        {
            this.BindData();
        }
    }

    protected void MyData_Refresh(object sender, StoreReadDataEventArgs e)
    {
        this.BindData();
    }

    private void BindData()
    {
        Store store = this.GridPanel1.GetStore();

        store.DataSource = this.Data;
        store.DataBind();
    }

    private object[] Data
    {
        get
        {
            DateTime now = DateTime.Now;

            return new object[]
            {
                new object[] { "3m Co", 71.72, 0.02, 0.03, now },
                new object[] { "Alcoa Inc", 29.01, 0.42, 1.47, now },
                new object[] { "Altria Group Inc", 83.81, 0.28, 0.34, now },
                new object[] { "American Express Company", 52.55, 0.01, 0.02, now },
                new object[] { "American International Group, Inc.", 64.13, 0.31, 0.49, now },
                new object[] { "AT&T Inc.", 31.61, -0.48, -1.54, now },
                new object[] { "Boeing Co.", 75.43, 0.53, 0.71, now },
                new object[] { "Caterpillar Inc.", 67.27, 0.92, 1.39, now },
                new object[] { "Citigroup, Inc.", 49.37, 0.02, 0.04, now },
                new object[] { "E.I. du Pont de Nemours and Company", 40.48, 0.51, 1.28, now },
                new object[] { "Exxon Mobil Corp", 68.1, -0.43, -0.64, now },
                new object[] { "General Electric Company", 34.14, -0.08, -0.23, now },
                new object[] { "General Motors Corporation", 30.27, 1.09, 3.74, now },
                new object[] { "Hewlett-Packard Co.", 36.53, -0.03, -0.08, now },
                new object[] { "Honeywell Intl Inc", 38.77, 0.05, 0.13, now },
                new object[] { "Intel Corporation", 19.88, 0.31, 1.58, now },
                new object[] { "International Business Machines", 81.41, 0.44, 0.54, now },
                new object[] { "Johnson & Johnson", 64.72, 0.06, 0.09, now },
                new object[] { "JP Morgan & Chase & Co", 45.73, 0.07, 0.15, now },
                new object[] { "McDonald\"s Corporation", 36.76, 0.86, 2.40, now },
                new object[] { "Merck & Co., Inc.", 40.96, 0.41, 1.01, now },
                new object[] { "Microsoft Corporation", 25.84, 0.14, 0.54, now },
                new object[] { "Pfizer Inc", 27.96, 0.4, 1.45, now },
                new object[] { "The Coca-Cola Company", 45.07, 0.26, 0.58, now },
                new object[] { "The Home Depot, Inc.", 34.64, 0.35, 1.02, now },
                new object[] { "The Procter & Gamble Company", 61.91, 0.01, 0.02, now },
                new object[] { "United Technologies Corporation", 63.26, 0.55, 0.88, now },
                new object[] { "Verizon Communications", 35.57, 0.39, 1.11, now },
                new object[] { "Wal-Mart Stores, Inc.", 45.45, 0.73, 1.63, now }
            };
        }
    }
</script>

<!DOCTYPE html>

<html>
<head runat="server">
    <title>Simple Array Grid With Paging and Remote Reloading - Ext.NET Examples</title>
    

    <script>
        var template = '<span style="color:{0};">{1}</span>';

        var change = function (value) {
            return Ext.String.format(template, (value > 0) ? "green" : "red", value);
        };

        var pctChange = function (value) {
            return Ext.String.format(template, (value > 0) ? "green" : "red", value + "%");
        };
    </script>

    <ext:XScript runat="server">
        <script type="text/javascript">
            var handlePageSizeSelect = function (item, records) {
                var curPageSize = #{GridPanel1}.store.pageSize,
                    wantedPageSize = parseInt(item.getValue(), 10);

                if (wantedPageSize != curPageSize) {
                    #{GridPanel1}.store.pageSize = wantedPageSize;
                    #{GridPanel1}.store.reload();
                }
            }

            function bindMe() {

            }
        </script>

    </ext:XScript>
</head>
<body>
    <form runat="server">
        <ext:ResourceManager runat="server" Namespace="" Theme="Gray" />

        <h1>Error simulation</h1>

        <p>Click the button and then close the window. </p>
		
		<ext:Button runat="server" ID="btn" OnClientClick="#{win}.show()"></ext:Button>
	    <ext:Window runat="server" Width="900" Height="500" Modal="True" Icon="Book" CloseAction="Destroy" 
	                           Hidden="true" Title="Service Providers"  Layout="fit" ID="win">
		<Items>

        <ext:GridPanel
            ID="GridPanel1"
            runat="server"
            Title="Array Grid"
            Width="800">
            <Store>
                <ext:Store ID="Store1" runat="server" OnReadData="MyData_Refresh" PageSize="10">
                    <Model>
                        <ext:Model runat="server">
                            <Fields>
                                <ext:ModelField Name="company" />
                                <ext:ModelField Name="price" Type="Float" />
                                <ext:ModelField Name="change" Type="Float" />
                                <ext:ModelField Name="pctChange" Type="Float" />
                                <ext:ModelField Name="lastChange" Type="Date" />
                            </Fields>
                        </ext:Model>
                    </Model>
                </ext:Store>
            </Store>
            <ColumnModel runat="server">
                <Columns>
                    <ext:RowNumbererColumn runat="server" Width="35" />
                    <ext:Column runat="server" Text="Company" DataIndex="company" Flex="1" />
                   
                    <ext:ComponentColumn runat="server" Text="Last Updated" Width="125" DataIndex="lastChange" Format="H:mm:ss" >
	                    <Listeners>
		                    <Bind Handler="bindMe"></Bind>
	                    </Listeners>
	                    <Component>
		                    <ext:ComboBox runat="server"  ForceSelection="true" ValueField="PersonId" DisplayField="FullName" QueryMode="Local">
			                    <Store>
				                    <ext:Store runat="server">
					                    <Model>
						                    <ext:Model runat="server" IDProperty="PersonId" >
							                    <Fields>
								                    <ext:ModelField Name="PersonId" Type="Int"/>
								                    <ext:ModelField Name="FullName"/>
								                    <ext:ModelField Name="DispatchId" AllowNull="True"/>
							                    </Fields>
						                    </ext:Model>
					                    </Model>
				                    </ext:Store>
			                    </Store>
		                    </ext:ComboBox>
	                    </Component>
                    </ext:ComponentColumn>
					 <ext:ComponentColumn runat="server" Text="Last Updated" Width="125" DataIndex="lastChange" Format="H:mm:ss" >
	                    <Listeners>
		                    <Bind Handler="bindMe"></Bind>
	                    </Listeners>
	                    <Component>
		                    <ext:ComboBox runat="server"  ForceSelection="true" ValueField="PersonId" DisplayField="FullName" QueryMode="Local">
			                    <Store>
				                    <ext:Store runat="server">
					                    <Model>
						                    <ext:Model runat="server" IDProperty="PersonId" >
							                    <Fields>
								                    <ext:ModelField Name="PersonId" Type="Int"/>
								                    <ext:ModelField Name="FullName"/>
								                    <ext:ModelField Name="DispatchId" AllowNull="True"/>
							                    </Fields>
						                    </ext:Model>
					                    </Model>
				                    </ext:Store>
			                    </Store>
		                    </ext:ComboBox>
	                    </Component>
                    </ext:ComponentColumn>
                </Columns>
            </ColumnModel>
            <View>
                <ext:GridView runat="server" StripeRows="true" />
            </View>
            <BottomBar>
                 <ext:PagingToolbar runat="server">
                    
                </ext:PagingToolbar>
            </BottomBar>
            
        </ext:GridPanel>
		</Items>
		</ext:Window>
    </form>
</body>
</html>
Note that you have to resfresh the page after closing window ( as window was destoyed it will not reappear again)

Click image for larger version. 

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