The out-of-the-box ACA.cuix file already defines a Double Click Action for Multi-View Blocks (which is what Schedule Tags are), but it is set to edit the Multi-View Block definition.
As it turns out, the CUI does not have a command defined that runs the AECPROPERTYDATAEDIT command. But it is easy enough to add one.
- Type CUI at the Command: prompt. (Or, on the Manage ribbon tab, on the Customization panel, choose the User Interface tool.)
- Verify that the CUI dialog is fully expanded (arrow button in the lower right corner of the dialog points to the left) and that the Customize tab is the current tab (as seen in the image above).
- In the Command List panel (lower left side; expand the panel if it is "closed"), select the Create a new command button.
- In the Properties panel (lower right side, expand the panel if it is "closed"), edit the properties of the new command as shown in the image below. I was not intending to use this command on a ribbon panel or a toolbar, so I did not create a custom button image, but used the out-of-the-box one for Property Set Definition edit. The Element ID will be automatically generated; yours may vary from what is shown here.
- In the Customizations in... panel (upper left side, expand the panel if it is "closed"), expand the ACA node (if necessary) and then expand the Double Click Actions node under the ACA node.
- Scroll down in the Customizations in... panel, if required,to find the Multi-View Block node under the Double Click Actions node and expand the Multi-View Block node.
- In the Command List panel, left click and drag the Property Data Edit command up to the Customizations in... panel and drop it on the Multi-View block node.
- The Property Data Edit command replaces Multi-View Block Edit as the Double Click Action for Multi-View Blocks.
- Select OK to dismiss the Customize User Interface dialog and to register your changes.
If you want to edit the Multi-View Block Defintion, you can still select an instance and, on the Multi-View Block contextual ribbon tab, on the General panel, select the Edit Style tool, or right click and choose Edit Multi-View Block Definition from the context menu.
Having edited the ACA.cuix file, you will want to back up the modified version so that you can restore it later, should the CUIX file get reset by a reinstallation or lost/corrupted through some catastrophic event. Also, as always, you can click on any of the images to see a full-size version.