global mouse left click event in c++

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C++

Hi,

i have a text box which is implemented as a window, when double clicked the window makes the text box editable, and I need it to save the changes of the text box, if I click OUTSIDE the textbox( basically the window that contains the text box).

this window containing textbox is implemented as modal window. If I click outside the editable window, it beeps, as if does not want to loose attention, and hence the mouse click event code which I had implemented the window behind it, does not get triggerred.

what to do?

I have been suggested to use a gloabl mouse click event and to capture x,y of the mouse left click and compare it with the boundaries of the textbox window.

how do I implement this global mouse click event?

waiting eagerly for the supportive answers.