Problems with DBLookupComboBox

Hello to everybody! I've two Query1 (Master) an Query2 (datail),
DBLookupComboBox1 connected with Query1 and DBLookupComboBox2 connected with
Query2. I want:
1) When I select an item in DBLookupComboBox1, that the DBLookupComboBox2
show the first item of Query2 (that's updated and positioned on the first
element).
2) When I press a button that the two DBLookupComboBox don't show nothing.

Else if someone know different component (i need of free one), that's more
usefull for this can you say me.

Thanks Alan


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