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[RHCP]

I've observed that control clicking the xbuttons doesn't work in a number of situations. 

; Window messages generated by controlclicking X2
<00004> 00811852 P WM_XBUTTONDOWN fwKeys:MK_XBUTTON2 xPos:520 yPos:379
<00005> 00811852 P WM_XBUTTONUP fwKeys:0000 xPos:520 yPos:379

; Window messages generated by a physical press of XButton2
<00013> 00811852 P WM_XBUTTONDOWN fwKeys:MK_XBUTTON2 | 00020000 xPos:1013 yPos:714
<00014> 00811852 P WM_XBUTTONUP fwKeys:00020000 xPos:1013 yPos:714

MSDN states:

 

The high-order word [of wParam] indicates which button was clicked. It can be one of the following values.

XBUTTON1 - 0x0001

XBUTTON2 - 0x0002

 

From the message log you can see that this high order word (0x00020000) is not being set by controlclick.

 

If i send the appropriate messages (with the correct lParam and wParam values) via post message the window recognises it as an XButton click.