>Actually I'm trying to make an object dissapear when another object got focus,
>Assume a combobox has 2 object, a textbox and a listbox, if neither of that object got focus, the listbox dissapear.
>Hope this can explain what I meant.
>
>Thanks,

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As Erik said,

* thisform.txtbox1.gotfocus()
Thisform.lstbox1.visible = .T.

* Thisform.txtbox1.lostfocus()
Thisform.lstbox1.visible = .F.

* ThisForm.txtbox2.gotfocus()
Thisform.lstbox1.visible = .T.

* Thisform.txtbox2.lostfocus()
Thisform.lstbox1.visible = .F.

It will Save much time to Busy Check the current active object is or not your desire txtbox.

Otherwise, you need to add a timer to check the current active object from time to time.. ~_~

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In File Section, there is a textbox called txteval will have similar feature!

when gotfocus, show another longer txtbox to input expression,
when lostfocus, return back the EVAL() and reverse the visible setting...

^_~ Good Luck!