@) This testcase should be run with the option \"-u DROP_DOWN_COMBO_BOX\". A ComboBox widget of type DROP_DOWN_COMBO_BOX should be displayed. A ComboBox should display an empty TextField and a List widget. Beneath the ComboBox widget there should be an empty TextField labelled \"Enter New String\", a ToggleButton labelled \"Unique\", a Scale labelled \"Position\" and a PushButton labelled \"Add String\". #) Verify that the ComboBox List displays the strings \"Apples\", \"Blueberries\" and \"Cherries\" and that the scrollbar slider to the right of the List fills the trough. #) In the TextField labelled \"Enter New String\", enter a string of text which does not match any of the existing text strings displayed in the ComboBox List. Select the ToggleButton indicator labelled \"Unique\". Set the \"Position\" Scale to 1. Click MB1 on the \"Add String\" PushButton to add the entered text to the ComboBox List. Verify that the text string entered is displayed as the first item in the ComboBox List. The value of the ComboBox XmNitemsCount resource should be incremented to 4. Verify that the value of XmNitemsCount printed to the terminal equals 4. C) @) The ComboBox List has been reset to display the original three strings \"Apples\", \"Blueberries\" and \"Cherries\". In addition, the TextField labelled \"Enter New String\", the \"Unique\" ToggleButton and the \"Position\" Scale should all be reset to their default settings. #) Enter a text string into the TextField labelled \"Enter New String\" that matches one of the strings currently displayed in the List widget. Move the \"Position\" Scale slider to the value 4. Click MB1 on the \"Add String\" PushButton to add the entered text string as the fourth item in the ComboBox List. Verify that the same three original strings are displayed in the ComboBox List and that the ComboBox List scrollbar slider no longer fills the trough. Click MB1 on the downward pointing arrow of the List scrollbar until the scrollbar slider reaches the bottom of the trough. Verify that the newly added text string is displayed as the last item in the ComboBox List. C) @) The ComboBox List has been reset to display the original three strings \"Apples\", \"Blueberries\" and \"Cherries\". In addition, the TextField labelled \"Enter New String\", the \"Unique\" ToggleButton and the \"Position\" Scale should all be reset to their default settings. #) Enter a text string into the TextField labelled \"Enter New String\" that matches one of the strings currently displayed in the List widget. Click MB1 on the indicator of the \"Unique\" ToggleButton. Move the \"Position\" Scale slider to the value 2. Click MB1 on the \"Add String\" PushButton to attempt to add the entered text string at the second position in the ComboBox List. Verify that the text string is not added to the ComboBox List and that the scrollbar slider should no longer fill the trough. C) @) The ComboBox List has been reset to display the original three strings \"Apples\", \"Blueberries\" and \"Cherries\". In addition, the TextField labelled \"Enter New String\", the \"Unique\" ToggleButton and the \"Position\" Scale should all be reset to their default settings. #) Enter a text string into the TextField labelled \"Enter New String\" that does not match any of the strings currently displayed in the List widget. Click MB1 on the indicator of the \"Unique\" ToggleButton. Move the \"Position\" Scale slider to the value 2. Click MB1 on the text string is added to the ComboBox List as the second item in the List and the scrollbar slider should no longer fill the trough. C) E)