This blog defines multi trigger in WPF.
<Window
x:Class="TypesOfTriggersDemo.MultiTRiggerDEmo"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MultiTRiggerDEmo"
Height="300"
Width="300"
Loaded="Window_Loaded">
<Window.Resources>
<Style
x:Key="MultTrigg"
TargetType="{x:Type
TextBox}" >
<Style.Triggers>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition
Property="IsFocused"
Value="True"></Condition>
<Condition
Property="IsMouseOver"
Value="True"></Condition>
</MultiTrigger.Conditions>
<MultiTrigger.Setters>
<Setter
Property="Background"
Value="yellow"
></Setter>
</MultiTrigger.Setters>
</MultiTrigger>
</Style.Triggers>
</Style>
</Window.Resources>
<StackPanel>
<TextBox
Style="{StaticResource
MultTrigg}"></TextBox>
</StackPanel>
</Window>