Check documentation for the latest version of dhtmlxSuite onButtonSelectShow DHTMLX Docs

onButtonSelectShow

fires when the list of options of ButtonSelect expands

void onButtonSelectShow(string|number id);
idstring|numberid of an item

Example

myToolbar.attachEvent("onButtonSelectShow", function(id){
    // your code here
});

Change log

added in version 4.5

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