GUI Buttons MouseUp and MouseDown

Hello guys..

Im trying to evaluate several conditions during the "clicking" cicle of a GUI button... in other words, i want to check stuff at OnMouseDown so i can do or not do more stuff at OnMouseUp...

I can do this with 3d meshes... im already "using void OnMouseUp()" and "using void OnMouseDown()" there.

The problem is at GUI components, when using:

Code (csharp):

1.  
2. if(GUI.Button (new Rect (10f,10f,150f,80f), "Hola"))
3. {
4.     Debug.Log("Adios");
5. }
6.  

So far, this is the only way i know to give actions to GUI.Button (im a noob). And the worst thing about this is that this only works on "onmouseup". I need to check some "if's" at "onmousedown" first!!!

Please tell me a way to accomplish this.

----
I have a temporal solution for this:

Code (csharp):

1.  
2. if(Event.current.type==EventType.Used)
3. {
4.     Debug.Log("Wawawawa");
5. }
6.  

This runs at mouseup as well as mousedown... and its doing the trick, but this will be a problem when i have more buttons on screen... i want to do things straight and clear.

HALP!! plz

ciao from mexico