Bind datagrid row with user control values in WPF-MVVM

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WPF

MVVM

I have multiple user control's in a window.Every User Control has a text box (txtGoodQty).On Double click of that text box opens a Window which has a data grid inside.I want to bind the user control's value to the data grid row.How can i achieve it using MVVM?
Can we use dependency property here, but i am not aware how to use it for binding.

What I have tried:

I did this

<TextBox.InputBindings>
               <MouseBinding MouseAction="LeftDoubleClick" Command="{Binding DataContext.testmethod,
                                       RelativeSource={RelativeSource FindAncestor,
                                       AncestorType={x:Type UserControl}}}"/>
               <!--CommandParameter="{Binding .}"/>-->
           </TextBox.InputBindings>

and in the somemethod i called the show property of window.
But now I am stucked up with bindings of user control values to the datagrid row.