Blinking a Symbol in background

Hi/Hola/Namaste,

I am currently trying to blink a symbol which is displayed as a graphic element using PictureMarkerSymbol. I have Used FlashShape() funtion to blink the symbol, I am able to blink the symbol but as long as the symbol blinks I cannot do any other operation on the mapcontrol. Please let me know how can make the PictureMarkerSymbol blink constantly as a background process so that it doesnt hinder other operations. Also I am able to blink the symbol for specific number of times only as an argument in FlashShape function. Please let me know how can I blink the symbol continuously without stopping. The code is below:
// *********************
IPoint pt = new PointClass();
pt.X = 58.5;
pt.Y = 27.5;

//Plot Marker Symbol
IMarkerElement pMrkElement = new MarkerElementClass();

System.Drawing.Bitmap dotNetBmp = new System.Drawing.Bitmap(@"D:\Symbols\Sample.bmp");
ESRI.ArcGIS.Display.IPictureMarkerSymbol bmpSym = new ESRI.ArcGIS.Display.PictureMarkerSymbolClass() as ESRI.ArcGIS.Display.IPictureMarkerSymbol;
bmpSym.Picture = ESRI.ArcGIS.ADF.COMSupport.OLE.GetIPictureDispFromBitmap(dotNetBmp) as stdole.IPictureDisp;
bmpSym.BitmapTransparencyColor = GetRGBColor(255, 255, 255);
bmpSym.Size = 18;
IMarkerSymbol markerSymbol = bmpSym as IMarkerSymbol;
pMrkElement.Symbol = markerSymbol;
// Blink the Symbol.
axMapControl1.FlashShape(pt, 30, 100, bmpSym);


Thanks in Advance/ Gracias,
Santosh