Problem in using direct screen access API

hi,

i have use directscreenaccess API to draw filled rectangle  to screen.I have created a function from where i have called the StartL() .and i have use the after function so that RunL called automatically after the specified interval.Inside RunL i m actually drawing the rectangle.
userdefined fuction
{
           iDirectScreenAccess->startL();
           After(timeinterval);
           
}

RunL
{
        //drawing the rectangle
}
But the problem is that when i call user defined function first time the RunL is not called .But second time it get called. can u pls tell me the reason.

Thanks in advance.