_TrackMouseEvent not working

[VbEndUser]

Dear D_Drmmr,

Thanks for pointing out my thread's problem.
I always want to post my code in the window just that i did not know the script.
There was no shortcut key or button.

Refer back to my question:
I not sure how to detect the mouse in and mouse leave in a control which attached to my dialogbox.
Please refer to my attachment.

I need to use Setcapture to detect my mouse position when it move over the control.
Of cause we can use control.RectInPt(mouse position) to track the mouse whether is in the control rect or not
If another window pop up, then i not able to to release the mouse using ReleaseCapture.

I will ReleaseCapture when user doubleclick on the control and at the same time another window will pop up.
Hope my question is clear.
Thanks.