Why some window events are made as property under trigger

Hi Deepa,This decision is taken by WPF Framework designers means UI is part is XAML not like winforms(C# code used for UI). using triggers, you can change the value of a given property, once a certain condition changes. Triggers come in multiple flavors: Property triggers, event triggers and data triggers. They allow you to do stuff that would normally be done in code-behind completely in markup instead, which is all a part of the ongoing process of separating style and code.https://stackoverflow.com/questions/2239855/what-are-the-different-triggers-in-wpfhttps://docs.microsoft.com/en-us/dotnet/api/system.windows.frameworkelement.triggers?redirectedfrom=MSDN&view=netframework-4.8#System_Windows_FrameworkElement_Triggershttps://www.wpf-tutorial.com/styles/trigger-datatrigger-event-trigger/Multi Trigger : WPF also supports multi triggers, which can monitor two or more property conditions and only trigger once all of them are satisfied.There are two types of multi triggers: The MultiTrigger, which just like the regular Trigger works on dependency properties, and then the MultiDataTrigger, which works by binding to any kind of property. Let's start with a quick example on how to use the MultiTrigger.https://www.wpf-tutorial.com/styles/multi-triggers-multitrigger-multidatatrigger/Thanks