>I hava a Combo, its recordsource is a alias. I don't know why combo show blanks until I selec a Option. I want first record appear not a blank line.

If your table name was "Buh" and the display field was "Field1",
you could put this into the Init() event of the combo box.

Select Buh
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This.DisplayValue = Buh.Field1


off-hand, I don't know of any properties in the combobox
control that would do this automatcally. Hope this helps.