Read SelText to obtain the text that is selected in the edit region of the combo box. When the combo box is the active control, SelText appears highlighted. Set SelText to replace the current selection with a different substring. If no text is selected when a value is assigned to SelText, the SelText string is inserted in the text at the cursor.你这个原因有可能是你的SelText更本就没有String值三少 :o)
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