To edit button commands you must be in track mode
And enable "Show: Buttons"
Plus select a PGC. If a button is selected the "edit" button will enable and the command for the button will display
to the left.
To change the current command click on the "edit" button
The VM editor will open up and display the current command and all its options
For buttons the most common command is the "LinkTailPGC". This command causes the post commands of the PGC to
execute. Which button was pressed can be determined by examaning SPRM 8.
To enter this command select "Jump by Sub-Instruction", this is the class of all "Link" commands.
Now as the destination of the jump select "Post commands of current PGC"
When finished with selecting the command click "Set"
Then click "Close" to continue editing the highlight layer.
You will need to determine which GPRM to use for this purpose, here we use GPRM 7 as an example. Select
the correct GPRM, click the "immediate" radio button, and set a value for this instance of the BOV.
Now click "Link" to add the "LinkTailPGC" command as above.
Select "Jump by Sub-Instruction" and the destination is "Post commands of current PGC". Click "Set" and "close"
You may also wish to prevent the button from accidentally working when normal subpictures are displayed. To do this you need
to dedicate another GPRM to BOV, its purpose is to indicate whether or not BOV is active as explained in
this page. For our example we use GPRM 0.
Start with a type 3 command
Select "Compare & Set-LinkSins", the middle choice. This order of execution performs the compare first, and if it
evaluates to TRUE performs the Set and then the Link, otherwise the command does nothing.
Setup the Compare and Set sections the same as the "Set GPRM" command above.
Finally set the destination of the link to "Post commands of current PGC", click "Set" and "Close"
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