Sometimes, you may need to correct the tabbing order for a window. You need to ensure that the cursor follows a logical path when a user presses Tab to move among the controls on the window. Ensure that the tabbing sequence is from left to right and top to bottom.
To change the tabbing order:
Click the control you want to set as the first control.
In the Properties grid, in the Tab Index property, type 0.
Select the next control, and in the Tab Index property, type 1, and so on until you have set a Tab Index for all relevant controls.