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WPF transparent window has white box arround it on XP but not vista

Posted By:      Posted Date: September 13, 2010    Points: 0   Category :WPF
Hi I have a WPF Transparent window which works fine on Vista but on XP, there is a white box around it. I am not sure what's causing it on XP, any suggestions will be very much appreciated. R

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Long version:

I have a transparent borderless window with a transparent canvas in it. The canvas can hold usercontrols that can be dragged around (like gadgets, widgets).

I want the user to be able to click anywhere outside the gadgets but within the canvas and hit whatever that is behind, like other windows from other programs or icons on the desktop for example. This is easy because everything is transparent except the gadgets. The problem comes when I want to drag new gadgets in from another window. When the window and canvas is transparent, it is not allowed to drop anything on them... (the drop target canvas is not registering any mouse events)

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My there was a question about WPF.http://social.msdn.microsoft.com/Forums/en/wpf/thread/7190959b-b1c6-4cd3-8108-600becc8b03b

Same question but now subject is Windows Forms.I can making transparent windows (back of form is visible) with below code

this.BackColor = Color.White;
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And I have a panel on form object.This panel's background color is transparent.Because panel's behind must be visible...and While Application running ,I'm clicking panel object.Rather I can't click to panel object.When I changed panel's background color to other color (except Color.Transparent) ,I can click panel object.What necessary I need to do ?

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