customizing ContentDialog in UWP - win-universal-app

Question

I have a ContentDialog, it has 2 default buttons : Primary and Secondary
I want to change some property of them, like width, height, position, font, ... or every property that one button has, How can I do it?

Answer 1

You can create a custom Style for the ContentDialog, the default template is here: https://msdn.microsoft.com/en-us/library/windows/apps/mt299120.aspx
<x:Double x:Key="ContentDialogMinWidth">320</x:Double>
<x:Double x:Key="ContentDialogMaxWidth">548</x:Double>
<x:Double x:Key="ContentDialogMinHeight">184</x:Double>
<x:Double x:Key="ContentDialogMaxHeight">756</x:Double>
<x:Double x:Key="ContentDialogButtonMinWidth">130</x:Double>
<x:Double x:Key="ContentDialogButtonMaxWidth">202</x:Double>
<x:Double x:Key="ContentDialogButtonHeight">32</x:Double>
<x:Double x:Key="ContentDialogTitleMaxHeight">56</x:Double>
<Thickness x:Key="ContentDialogBorderWidth">1</Thickness>
<Thickness x:Key="ContentDialogButton1HostMargin">24,0,0,24</Thickness>
<Thickness x:Key="ContentDialogButton2HostMargin">4,0,24,24</Thickness>
<Thickness x:Key="ContentDialogContentMargin">24,0,24,0</Thickness>
<Thickness x:Key="ContentDialogContentScrollViewerMargin">0,0,0,24</Thickness>
<Thickness x:Key="ContentDialogTitleMargin">24,18,24,0</Thickness>
<!-- Default style for Windows.UI.Xaml.Controls.ContentDialog -->
<Style TargetType="ContentDialog">
<Setter Property="Foreground" Value="{ThemeResource SystemControlPageTextBaseHighBrush}" />
<Setter Property="Background" Value="{ThemeResource SystemControlBackgroundChromeMediumLowBrush}" />
<Setter Property="HorizontalAlignment" Value="Center" />
<Setter Property="VerticalAlignment" Value="Top" />
<Setter Property="IsTabStop" Value="False" />
<Setter Property="MaxHeight" Value="{ThemeResource ContentDialogMaxHeight}" />
<Setter Property="MinHeight" Value="{ThemeResource ContentDialogMinHeight}" />
<Setter Property="MaxWidth" Value="{ThemeResource ContentDialogMaxWidth}" />
<Setter Property="MinWidth" Value="{ThemeResource ContentDialogMinWidth}" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ContentDialog">
<Border x:Name="Container">
<Grid x:Name="LayoutRoot">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Border x:Name="BackgroundElement"
Background="{TemplateBinding Background}"
FlowDirection="{TemplateBinding FlowDirection}"
BorderThickness="{ThemeResource ContentDialogBorderWidth}"
BorderBrush="{ThemeResource SystemControlForegroundAccentBrush}"
MaxWidth="{TemplateBinding MaxWidth}"
MaxHeight="{TemplateBinding MaxHeight}"
MinWidth="{TemplateBinding MinWidth}"
MinHeight="{TemplateBinding MinHeight}" >
<Grid x:Name="DialogSpace" VerticalAlignment="Stretch">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<ScrollViewer x:Name="ContentScrollViewer"
HorizontalScrollBarVisibility="Disabled"
VerticalScrollBarVisibility="Disabled"
ZoomMode="Disabled"
Margin="{ThemeResource ContentDialogContentScrollViewerMargin}"
IsTabStop="False">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<ContentControl x:Name="Title"
Margin="{ThemeResource ContentDialogTitleMargin}"
Content="{TemplateBinding Title}"
ContentTemplate="{TemplateBinding TitleTemplate}"
FontSize="20"
FontFamily="XamlAutoFontFamily"
FontWeight="Normal"
Foreground="{TemplateBinding Foreground}"
HorizontalAlignment="Left"
VerticalAlignment="Top"
IsTabStop="False"
MaxHeight="{ThemeResource ContentDialogTitleMaxHeight}" >
<ContentControl.Template>
<ControlTemplate TargetType="ContentControl">
<ContentPresenter
Content="{TemplateBinding Content}"
MaxLines="2"
TextWrapping="Wrap"
ContentTemplate="{TemplateBinding ContentTemplate}"
Margin="{TemplateBinding Padding}"
ContentTransitions="{TemplateBinding ContentTransitions}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
</ControlTemplate>
</ContentControl.Template>
</ContentControl>
<ContentPresenter x:Name="Content"
ContentTemplate="{TemplateBinding ContentTemplate}"
Content="{TemplateBinding Content}"
FontSize="{ThemeResource ControlContentThemeFontSize}"
FontFamily="{ThemeResource ContentControlThemeFontFamily}"
Margin="{ThemeResource ContentDialogContentMargin}"
Foreground="{TemplateBinding Foreground}"
Grid.Row="1"
TextWrapping="Wrap" />
</Grid>
</ScrollViewer>
<Grid x:Name="CommandSpace" Grid.Row="1" HorizontalAlignment="Stretch" VerticalAlignment="Bottom">
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Border x:Name="Button1Host"
Margin="{ThemeResource ContentDialogButton1HostMargin}"
MinWidth="{ThemeResource ContentDialogButtonMinWidth}"
MaxWidth="{ThemeResource ContentDialogButtonMaxWidth}"
Height="{ThemeResource ContentDialogButtonHeight}"
HorizontalAlignment="Stretch" />
<Border x:Name="Button2Host"
Margin="{ThemeResource ContentDialogButton2HostMargin}"
MinWidth="{ThemeResource ContentDialogButtonMinWidth}"
MaxWidth="{ThemeResource ContentDialogButtonMaxWidth}"
Height="{ThemeResource ContentDialogButtonHeight}"
Grid.Column="1"
HorizontalAlignment="Stretch" />
</Grid>
</Grid>
</Border>
</Grid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
If you want to have full control over the content, visual, behaviour or animation for the Dialog, create a custom UserControl which implement events and elements.

Answer 2

Another solution is that you can firstly remove default buttons and event handlers:
As you can see there is a Grid control where you can place different controls. You can add your buttons here and also customize their design.
<ContentDialog
x:Class="SampleApp.Windows10.SampleContentDialog"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Grandler.Windows10"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Title="TITLE">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Button x:Name="AcceptButton" Grid.Column="0" Content="Accept"/>
<Button x:Name="CancelButton" Grid.Column="1" Content="Ignore"/>
</Grid>
</ContentDialog>