Custom WPF window style - wpf

Question

I'm trying to make a custom window style. The goal is to create a template that migth be used by every window in my application. Template contains the toolbar, title and "the area which will be used by window". The problem is: When I use my style I can no longer add grid and conrols.
App.xaml
<Style x:Key="CustomWindowStyle" TargetType="{x:Type Window}">
<Setter Property="WindowStyle" Value="None"/>
<Setter Property="AllowsTransparency" Value="True"/>
<Setter Property="ResizeMode" Value="NoResize"/>
<Setter Property="Background" Value="MintCream"/>
<Setter Property="BorderBrush" Value="#0046E7"/>
<Setter Property="BorderThickness" Value="2"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Window}">
<Grid Background="{TemplateBinding Background}">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<StackPanel Grid.ColumnSpan="2">
<TextBlock TextAlignment="Center"
Margin="0 10 0 0"
FontSize="22"
FontWeight="DemiBold"
Foreground="RoyalBlue"
Text="{TemplateBinding Title}"/>
</StackPanel>
<StackPanel Grid.Row="0" Grid.Column="1"
Orientation="Horizontal"
HorizontalAlignment="Stretch"
VerticalAlignment="Center"
Margin="0 10 15 0">
<Button Style="{StaticResource MinimizeButtonStyle}"
Width="25"
Height="22"
Margin="0 0 10 0"/>
<Button Style="{StaticResource CloseButtonStyle}"
Width="25"
Height="22"/>
</StackPanel>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
MainWindow.xaml
<Window x:Class="WindowForHW2.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WindowForHW2"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525"
Style="{StaticResource CustomWindowStyle}">
<Grid>
<Button Width="100" Height="40" Content="Hello"/>
</Grid>
Template Works, but I cannot add smth anymore:

Answer 1

You need to add a ContentPresenter where the Content of your Window goes. Try this.
<Style x:Key="CustomWindowStyle" TargetType="{x:Type Window}">
<Setter Property="WindowStyle" Value="None"/>
<Setter Property="AllowsTransparency" Value="True"/>
<Setter Property="ResizeMode" Value="NoResize"/>
<Setter Property="Background" Value="MintCream"/>
<Setter Property="BorderBrush" Value="#0046E7"/>
<Setter Property="BorderThickness" Value="2"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Window}">
<Grid Background="{TemplateBinding Background}">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<StackPanel Grid.ColumnSpan="2">
<TextBlock TextAlignment="Center"
Margin="0 10 0 0"
FontSize="22"
FontWeight="DemiBold"
Foreground="RoyalBlue"
Text="{TemplateBinding Title}"/>
</StackPanel>
<StackPanel Grid.Row="0" Grid.Column="1"
Orientation="Horizontal"
HorizontalAlignment="Stretch"
VerticalAlignment="Center"
Margin="0 10 15 0">
<Button Content="+"
Width="25"
Height="22"
Margin="0 0 10 0"/>
<Button Content="X"
Width="25"
Height="22" />
</StackPanel>
<!-- here goes the content -->
<ContentPresenter Grid.Row="1"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>