CppKore: add getter for child control count

src/thirdparty/cppnet/cppkore/Control.cpp

@@ -725,6 +725,11 @@ namespace Forms
 		return this->_RTTI;
 	}
 
+	uint32_t Control::GetControlCount()
+	{
+		return this->_Controls->Count();
+	}
+
 	Control* Control::FindForm()
 	{
 		auto Cur = this;

src/thirdparty/cppnet/cppkore/Control.h

@@ -209,6 +209,8 @@ namespace Forms
 		HWND GetHandle();
 		// Returns the type of this control
 		ControlTypes GetType();
+		// Returns the number of child controls
+		uint32_t GetControlCount();
 
 		// Retrieves the form that the control is on.
 		Control* FindForm();