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Focus Or Caret On TextBox Control Gone If ToolstripDropdown Is shown In Custom Controls Windows Forms C#

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Im trying to implement a custom textbox control with auto-suggest features. Upon rendering the ToolStripDropdown object just below the textbox control, the focus seems to be lost.

I found the trick by setting the AutoClose property to false in the Textbox OnHandleCreated(EventArgs e) event. See the code below:
_dropDown.AutoClose = false; //ToolStripDropDown object

Greg

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