RadComboBox after the fonts can not be used to show it in black?

[Niko]

RadComboBox after the fonts disable to show it in black?

Or  Readonly properties  can  used? How to use

Thanks

[Niko]

Problems have been solved
no disable 

var Enable1 = true;

cboCopySubset.get_inputDomElement().style.backgroundColor=

"#f3f3f3";

 

 

function OnClientDropDownOpening1(sender, eventArgs)

{eventArgs.set_cancel(!Enable1);

}

function HandkeKeyPress1(sender, eventArgs)

{if(!Enable1)

eventArgs.get_domEvent().keyCode=64;

}

<telerik:RadComboBox ID="cboCopySubset" OnClientKeyPressing="HandkeKeyPress1" OnClientDropDownOpening="OnClientDropDownOpening1" runat="server" Width="150px"></telerik:RadComboBox>