Check we are working with the correct DataGrid. fixes #477

Author: ButchersBoy

MainDemo.Wpf/ProvingGround.xaml

@@ -21,17 +21,29 @@
                 -->
             </ResourceDictionary.MergedDictionaries>
 
-            
 
-            
+
+
 
         </ResourceDictionary>
     </UserControl.Resources>
 
-    <Grid>
-        <Expander Header="This is My Header" IsExpanded="True" HorizontalContentAlignment="Center">
-            <TextBlock>Hello World</TextBlock>
-        </Expander>
-    </Grid>
+    <materialDesign:DialogHost Identifier="RootDialog">
+        <ScrollViewer VerticalScrollBarVisibility="Auto" Background="White">
+            <Grid>
+                <TextBox x:Name="loginText" 
+                         materialDesign:HintAssist.FloatingScale=".56" 
+                         materialDesign:HintAssist.FloatingOffset="1,-42"
+                         Style="{StaticResource MaterialDesignFloatingHintTextBox}" materialDesign:TextFieldAssist.TextBoxViewMargin="1 0 1 0" Margin="0,350,0,0" materialDesign:HintAssist.IsFloating="True" HorizontalAlignment="Center" VerticalAlignment="Top" Width="400" FontSize="36" Height="100" Background="White" Padding="6,0,0,2">
+                    <materialDesign:HintAssist.Hint>
+                        <StackPanel Orientation="Horizontal" Margin="0 0 0 0">
+                            <materialDesign:PackIcon Kind="Account" Width="50" Height="50" />
+                            <TextBlock Padding="5,0,0,0">Enter login</TextBlock>
+                        </StackPanel>
+                    </materialDesign:HintAssist.Hint>
+                </TextBox>
+            </Grid>
+        </ScrollViewer>
+    </materialDesign:DialogHost>
 
 </UserControl>

MaterialDesignThemes.Wpf/DataGridAssist.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Linq;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Controls.Primitives;
@@ -160,8 +161,8 @@ private static void DataGridOnPreviewMouseLeftButtonDown(object sender,
 
             while (inputHitTest != null)
             {
-                var dataGridCell = inputHitTest as DataGridCell;
-                if (dataGridCell != null)
+                var dataGridCell = inputHitTest as DataGridCell;                
+                if (dataGridCell != null && dataGrid.Equals(dataGridCell.GetVisualAncestry().OfType<DataGrid>().FirstOrDefault()))
                 {
                     ToggleButton toggleButton;
                     ComboBox comboBox;