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color picker event

if i want to create text box for get hex color code for dhx color picker, It can return color code.
But if i want too return -1 to my text box what i can do?

You can attach custom code which will be called each time when color selected in colorpicker as 

cp.setOnSelectHandler(function(rgb,hex,hsl){
   //any custom here
})

beware, that usage of setOnSelectHandler will break "link-to-input functionality"