Is this possible? Calling a sub in a Child webpage from the Master webpage

I am using a MasterPage & a default.aspx page

The MasterPage contains a <asp:DropDownList control.
When this ddl changes, it fires this sub:
 Protected Sub DropDownList1_SelectedIndexChanged(ByVal sender As [Object], ByVal e As EventArgs)

I have a sub in Default.aspx code-behind that uses the value set in the <asp:DropDownList control DropDownList1. The sub name is doStuff_default()

Is there a way to call the sub doStuff_default() from the MasterPage code-behind DropDownList1_SelectedIndexChanged ?