Tool Tip : Tool Tip not displayed when field is read Only

Hi All,

I want to tool tip to be displayed only for some conditions.

So, i'm trying to display the tool tip using the following code:

if(a>b)

{

     this.assist.toolTip.rawValue = "required string";

}

But the code dosen't work when the field becomes read Only.

Is there any way to display the tool tip for a read Only field ?

Thanks,

VJ

.