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Listing 12-9. Using the CallingConvention Property // pinvoke_thiscall.cpp // Compile with cl /clr:safe pinvoke_thiscall.cpp. using namespace System; using namespace System::Text; using namespace System::Runtime::InteropServices; namespace NativeLib { [ DllImport( "nativeclasslib.dll", EntryPoint=" F@NativeClass@@QAEHH@Z", CallingConvention=CallingConvention::ThisCall )] extern int F( IntPtr ths, int i ); // static NativeClass* NativeClass::CreateObject(); [DllImport( "nativeclasslib.dll", EntryPoint= " CreateObject@NativeClass@@SAPAV1@XZ" )] extern IntPtr CreateObject(); // static void NativeClass::DeleteClass( NativeClass* p ) [ DllImport( "nativeclasslib.dll", EntryPoint= " DeleteObject@NativeClass@@SAXPAV1@@Z" )] extern void DeleteObject( IntPtr p ); }

Summary

Notice that this method calls the base OnApplyTemplate() method, and then calls the GoToState() method, passing it false. This is the first time that the GoToState() method will be called, and you are passing it false so that it does not use any transitions while changing the state. The initial view of the control should not have any animations to get it to the initial state. 2. At this point, you need to wire up event handlers to handle the mouse events. First, create the event handlers themselves, as follows: void corePart_MouseEnter(object sender, MouseEventArgs e) { isMouseOver = true; GoToState(true); } void corePart_MouseLeave(object sender, MouseEventArgs e) { isMouseOver = false; GoToState(true); } void corePart_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { isPressed = true; GoToState(true); }