add click handler for treeviewitem when Template used with checkboxes

Author: mymockdoor

Radzen.Blazor/RadzenTreeItem.razor

@@ -15,7 +15,7 @@
         }
         @if (Template != null)
         {
-            <div class=@LabelClass @onkeydown:stopPropagation>@Template(this)</div>
+            <div class=@LabelClass @onkeydown:stopPropagation @onclick="@OnTemplateClick">@Template(this)</div>
         } else
         {
             <label for="@(GetHashCode())" class=@LabelClass>@Text</label>

Radzen.Blazor/RadzenTreeItem.razor.cs

@@ -487,5 +487,14 @@ await Tree.ItemContextMenu.InvokeAsync(new TreeItemContextMenuEventArgs()
                 ShiftKey = args.ShiftKey
             });
         }
+
+        internal async Task OnTemplateClick(MouseEventArgs args)
+        {
+            if (Tree != null && Tree.AllowCheckBoxes && Checkable)
+            {
+                var currentValue = IsChecked();
+                await CheckedChange(currentValue == true ? false : true);
+            }
+        }
     }
 }