GPiotr

Seeing that one version works and one doesn't and one major difference is the change from the "Run in UI Thread" to "Run in Any Thread". I don't understand why that would make the difference?

Hello,

The change that fixed the problem is changing the parameter of 'GetWindowLongA' and 'SetWindowLongA' from I64 to U32.

Regarding the background shining through I did not encounter that issue on my machine.

Hello,

At the beginning sorry for my mistake. I run the VI on LV2009 and it did not return error so I overlooked the wrong data type.

Regarding the strange look of the window. I have the same configuration: Win XP SP3 and under LV2010 I get a proper look of the window.

The corrected and, this time, commented code is in the attachment.

Toolbar Window.vi

Hello,

Try to use "Call Chain" function located in Programming->Application Control. It will return the array of VIs in a call stack.

Yes, I had to hide and show again the window in order for it to refresh. Sorry for lack of comments in the code.

Hello i think this might do a trick (see attachment). Is this what you are looking for?

Toolbar.vi