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You want to modify the default shortcut menu that is displayed when you press CTRL while right-clicking (or another key combination).
Solution
To modify the shortcut menu
On the command line, enter cui
On the Customize tab of the Customize User Interface (CUI) Editor, right-click under Command List, right-click. Click New Command.
Enter a name for the new command (for example, test ctrl menu click1).
Locate the shortcut menu that you want to modify from the list of menus displayed in the upper-left of the CUI Editor (for example, Xref Object Menu).
Select the desired shortcut menu. The alias of the menu will be displayed on the right (for example, (POP513, OBJECT_XREF)).
Copy the second parameter (in this example, OBJECT_XREF) and then select your custom command under the Custom Command category in the Command list.
The macro for the original menu was the following:
$P0=SNAP $p0=*
Change SNAP to the parameter copied in Step 5 (OBJECT_XREF) so that the macro for the new command is as follows:
$P0=OBJECT_XREF $p0=*
In the upper-left of the CUI Editor, locate Ctrl+Click.
Drag the new command that you created from the Command list to Button2.
Click the Ctrl+Click Button 2 command to verify that the new macro is displayed on the left.
Click Apply and then close the CUI Editor.