Solved. Thanks to an old post from @Lindon , thanks!
inline function onbtn_GET_SAMPLE_LENGTHControl(component, value) { if (value) { local selection = SP_1.createSelection(".*"); local sampleStart = selection[0].get(SP_1.SampleStart); local sampleEnd = selection[0].get(SP_1.SampleEnd); Console.print("Sample Start: " + sampleStart + ", Sample End: " + sampleEnd); } }; Content.getComponent("btn_GET_SAMPLE_LENGTH").setControlCallback(onbtn_GET_SAMPLE_LENGTHControl);