actually i had simple problem, in header have custom two icon (menu icon and back icon) back icon is set unvisible, menu icon is set visible, then in events i set menu icon to open panel, and i set another events to menu icon setproperty to change from menu icon to back icon set successfully when i click menu icon it changes to back icon work well
problem is I set another event set property to back icon to change from back icon to menu icon and i created another events to back icon to close panel when i click back icon, Back icon doesn't changes to menu icon after closed a panel
whatever i set events to back icon nothing happening? what do i do 
