Get Control inside ContentControl as CommandParameter and programatically

Question

Hi,
In a Window I've a ContentControl and a button 
<ContentControl x:Name="buscarRegion"
prism:RegionManager.RegionManager="{Binding RegionManager,
RelativeSource={RelativeSource AncestorType={x:Type Window}, Mode=FindAncestor}}"
prism:RegionManager.RegionName="{x:Static inf:RegionNames.BuscarRegion}"/>
<Button Content="Button" HorizontalAlignment="Left"
Command="{Binding ExcelGridCommand}" CommandParameter="???????"/>
Prism does the work and UserControl with a grid inside appears in ContentControl, my problem are two:
-How can i pass the grid as parameter to ExcelGridCommand?. Button is not inside the UserControl and in xaml i don't find the way to do it
-How can i access to grid programatically ? I've been trying with VisualTreeHelper:
ContentPresenter cpresenter = VisualTreeHelper.GetChild(this.buscarRegion, 0) as ContentPresenter;
var nChildCount = VisualTreeHelper.GetChildrenCount(cpresenter.Content as DependencyObject);
for (int x = 0; x<nChildCount; x++)
FrameworkElement child = VisualTreeHelper.GetChild(cpresenter.Content as DependencyObject, x) as FrameworkElement; //returns a Border :-(
if (child == null)
continue;
// Is child of desired type and name?
if ( child.Name.Equals("grid"))
// Bingo! We found a match.
MessageBox.Show("Found matching element [{0}]", "grid");
break;
} // if
No way, any idea ?
Thank's in advance

Answer 1

-How can i pass the grid as parameter to ExcelGridCommand?. Button is not inside the UserControl and in xaml i don't find the way to do it
foreach (Grid grid in FindVisualChildren<Grid>(buscarRegion))
if (grid.Name.Equals("grid"))
theButton.CommandParameter = grid;
<Button x:Name="theButton" Content="Button" HorizontalAlignment="Left"
Command="{Binding ExcelGridCommand}" />
You will have to get a reference to the Grid element programmatically and then set the CommandProperty of the Button in the code-behind of the view. Refer to the below code for details.
-How can i access to grid programatically ? I've been trying with VisualTreeHelper:
You could use the following helper method:
public static IEnumerable<T> FindVisualChildren<T>(DependencyObject depObj) where T : DependencyObject
if (depObj != null)
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
if (child != null && child is T)
yield return (T)child;
foreach (T childOfChild in FindVisualChildren<T>(child))
yield return childOfChild;
Usage:
foreach (Grid grid in FindVisualChildren<Grid>(buscarRegion))
if (grid.Name.Equals("grid"))
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