Maximize Portlet

Hi,
I had made 2 portlet at run-time. I have code(server side) for close portlet as follows

Code:

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portlet.Tools.Add(new Tool(ToolType.Close, string.Concat(portlet.ClientID, ".hide();"), "Close Portlet"));

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Is there any method for maximize Portlet, as I done for close.

Thanks in advance.

Neeraj