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take value from lookup modal form

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I have been trying to take value from a lookup modal form that contains a grid showing values for choosing  to a main form editbox. How can i do this in Unigui? I tried many ways but i am unable to do show. 


Can you please guide what is the best way to do so>




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On the click event of the grid you can save the chosen value, and then 

set modalResult:=mrOK, or mrCancel if the user cancels the form.


In the mainform you use the showmodal with a callback function

to show the form in the first place, and then in that callback function

you do whatever with the saved value, depending on the modalresult.

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