I'm using Visual Studio 2005 and C#

So my problem is that the code i run below does work on page that doesn't use Master Page but once i use Master Page it just doesn't seem to be able to work.

Is there anything i need to add in order for this code to work on web pages that has Maste Page?

ShowImageButton = (ImageButton)this.FindControl(defineImageButton);

Is the image button in the master page. In that case u will have to use something like this

This.master.findcontrol("controlname");

I tried but doesn't seem to work as well.... And yes i already create the ImageButton on the web page that has master page

This is the code that i tried

ImageButton imgButton = (ImageButton)this.Master.FindControl(defineImageButton);

do a simple "View Source" on your page and find that button, you'll see that using MaterPage's changes the ID of controls (to keep them unique) Want more info? this article explains all (http://www.odetocode.com/Articles/450.aspx)

Thanks for the guidance as i finally got it working by checking out the site 

Below are the source code that i tested out:

ImageButton imgButton = (ImageButton)Master.FindControl("ContentPlaceHolder1").FindControl(defineImageButton);