Web Forms :: Interaction From Nested Master Pages To Content Page

I have 2 nested master pages, lets call them MP1 and MP2. MP1 is top level, MP2 is level

2. Then I have several content pages. Lets say I have 2 content pages for now CP1 and CP2. Each content page has a form that will have some user input and a SaveData()function that saves the data to a database. Each content page also has a "Save" button that calls the SaveData() function.

MP1 and MP2 have several link buttons. The functionality I need is this: Any time a user clicks on a link button in MP1 or MP2, the SaveData() function of the currently loaded page should be called. This is to save the data even if the user forgets to click the "Save" button before leaving the page.

So far I can do this from the link buttons in MP2. I followed the master pages tutorial # 7

In the .cs file for MP2, I declare:

public event EventHandler SaveData;

then i raise a "SaveData" event any time a link button in MP2 is clicked.in every content page (CP1, CP2 etc.) aspx file, I have Master Type directive to assign the Master Page to MP2.

in CP1, CP2 etc .cs file, i have the following code:
protected void Page_PreInit(object sender, EventArgs e)
{
//wire up the SaveData event from MP2 to Master_SaveData function in this page.
Master.SaveData += new EventHandler(Master_SaveData);
}
private void Master_SaveData(object sender, EventArgs e)
{
//when the MP2 SaveData event is raised, save the data in this page.
SaveData();
}

All of this works fine.Problem is I am not able to do a similar thing from MP1.What I have tried so far is to raise an event in MP1 that is handled in MP2. When the event is handled in MP2, it raises the SaveData event to be handled in the page. The event in MP1 is null and hence never raised.