You can select or unselect all the items by using the SelectedItems property of the ComboBoxAdv.
The following example illustrates how you can select or unselect the items in Button-click command using the SelectedItems property.
The following screenshot displays the items when the “Click to select all items” button is clicked.
Figure 1: “Click to select all items” button is clicked
The following screenshot clears all the items when the “Click to unselect all items” button is clicked.
Figure 2: “Click to unselect all items” button is clicked
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