How to disable maximize button in WPF page

In first (Window) tag on MainWindow.xaml page add

ResizeMode="CanMinimize"

This isn't like winforms, see the discussion here:

http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/d74820db-a002-4d4e-b96e-02d29dc4a119[^]

You can disable windows border and inside your window add close button only :) It's not that hard to do

There is no direct way to disbale the X button (in property ) in a Windows Form, like there is a property for Maximize button called MaximizeBox = false Or Minimize Box = false.

Notes: Before you use code, Please add a Close button in your form so that you can close your app.

Add the following library
using System.Runtime.InteropServices;
Declare the following as class level variable
const int MF_BYPOSITION = 0x400;
[DllImport("User32")]
private static extern int RemoveMenu(IntPtr hMenu, int nPosition, int wFlags);
[DllImport("User32")]
private static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);
[DllImport("User32")]
private static extern int GetMenuItemCount(IntPtr hWnd);

In the Form_Load() event, write the following code
private void Form1_Load(object sender, EventArgs e)
{
IntPtr hMenu = GetSystemMenu(this.Handle, false);
int menuItemCount = GetMenuItemCount(hMenu);
RemoveMenu(hMenu, menuItemCount - 1, MF_BYPOSITION);
}

I too was facing this same problem. The solution that i got is:

private void Page_Loaded(object sender, RoutedEventArgs e)
{
((NavigationWindow)LogicalTreeHelper.GetParent(this)).ResizeMode = ResizeMode.NoResize;
}

If you are using the NavigationWindow(a WPF page is default displayed in a NavigationWindow), we can set the ResizeMode of the NavigationWindow. :)

Try this :
ResizeMode="NoResize" , WindowStyle="ToolWindow"