After you place the VI on the block diagram, right click on it and select "Show front panel". LV will ask you if you want to convert the VI. Click "convert". Go to the block diagram of the VI and right click the control you want. Select Create>>Property node. A property node for that control will appear. Click where it says property and select Key Focus. Right click it and select "Change to write" and place it where it needs to be. Give the VI a name and save it.
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