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Building an Intellisensse editor(PLEASE HELP)

 
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Dear all,
I am building an editor with intellisense.My design is as follows:
When i type DOT, a Dialog box pops up at the position of the DOT containing the required items. This much I have implemented.
Now there is a problem:
As seen in many editors with intellisense(if possible please refer to JBuilder), when the popup window appears then the text editor has the focus i.e characters can be typed into it and also by the movement of cursor keys the items in the pop-up list box can be selected. So it seems as if the pop-up window is the child window of the text-editor window and the text-editor window delegates events to the pop-up window while itself remaining active.
Can anybody please suggest me how to implement it?
Thanks in advance
 
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