selectAll
Determines if the value contained in a control initially appears selected (highlighted) when tabbing to the control.
Property of
Combobox, Entryfield, SpinBox
Description
Set selectAll to true to give the user a shortcut for deleting or replacing the initial value in an entry field, a spin box, or a combobox. The entire value is highlighted when the user tabs to the control. The first character the user enters overwrites the value. Pressing Del or Backspace deletes the value. Pressing a direction key (such as Home or End) removes the highlight without erasing the value.
Clicking a control ignores selectAll; the cursor goes to the position clicked, and nothing is highlighted.
comboBox ...
The default for selectAll is True.
Setting selectAll to False prevents the entire combobox value from being highlighted when the combobox is given focus or when scrolling through option strings in the dropdown list.