keep focus in text box on a control bar

in my project when ever i click in a a text box, in a control bar, then move the mouse cursor off the text box i lose ability to type in the text box unless i reselect that text box and leave my cursor on it while i type in it.

what do i have to do in order to keep the abiltity to type in a text box, after i click it and move the mouse cursor off.

Here you go:
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thanks Owen