diff --git a/src/Semi.Avalonia/Controls/HeaderedContentControl.axaml b/src/Semi.Avalonia/Controls/HeaderedContentControl.axaml
index 19dad7c..e328594 100644
--- a/src/Semi.Avalonia/Controls/HeaderedContentControl.axaml
+++ b/src/Semi.Avalonia/Controls/HeaderedContentControl.axaml
@@ -79,7 +79,7 @@
                     BorderBrush="{TemplateBinding BorderBrush}"
                     BorderThickness="{TemplateBinding BorderThickness}"
                     CornerRadius="{TemplateBinding CornerRadius}">
-                    <Grid RowDefinitions="Auto,Auto,Auto">
+                    <Grid RowDefinitions="Auto,Auto,*">
                         <ContentPresenter
                             Name="PART_HeaderPresenter"
                             Grid.Row="0"