Load xaml file from another project using XamlReader

I have  a project say x with class Prints.xaml and button is defined as below:

 <GUIButton x:Name="CropView" BorderThickness="0" BorderColorKey="Black" ColorKey="Transparent"                        FilePath="Style.xaml"   HorizontalAlignment="Left" VerticalAlignment="Top" Margin="0" Grid.Row="0" Grid.Column="0"      />
Other Project Y has GUIButton it refrence from other project.
GUIButton.cs has method to load xaml file called style.xaml which is defined in project Y.
if (args.NewValue != null)
            {                string filePath = args.NewValue as string;                if (!string.IsNullOrEmpty(filePath)|| File.Exists(filePath))                {                    using (FileStream stream = new FileStream(filePath, FileMode.Open))                    {                        style = XamlReader.Load(stream) as Style;                    }                }            }
When i excute the method im getting an error Style.xaml not found since it is not in Project X. 
       Now i want to open the Style.xaml from project Y which is defined on Button in Project X. 
 Any help appreciated.