How can I invoke a custom button and send the method into DefaultListAppletPR.js file?

Hello,

I would like to add a custom button into the list applet. Once click on the button, the DefaultListAppletPR.js file would recognize the button method as the client property? How could I do that?

For example, I have below code under DefaultListAppletPR.prototype.BindData

if (PM.Get("enter button method") == "Y" {

                    expandCollapseAllLineItemRows();

}