I finally found a way, not the most beautiful thing, but it works:
public class ColorDialogExtension : ColorDialog { #region private const //Windows Message Constants private const Int32 WM_INITDIALOG = 0x0110; //uFlag Constants private const uint SWP_NOSIZE = 0x0001; private const uint SWP_SHOWWINDOW = 0x0040; private const uint SWP_NOZORDER = 0x0004; private const uint UFLAGS = SWP_NOSIZE | SWP_NOZORDER | SWP_SHOWWINDOW; #endregion #region private readonly //Windows Handle Constants private static readonly IntPtr HWND_TOPMOST = new IntPtr(-1); private static readonly IntPtr HWND_NOTOPMOST = new IntPtr(-2); private static readonly IntPtr HWND_TOP = new IntPtr(0); private static readonly IntPtr HWND_BOTTOM = new IntPtr(1); #endregion #region private vars //Module vars private int _x; private int _y; private string _title = null; #endregion #region private static methods imports //WinAPI definitions /// <summary> /// Sets the window text. /// </summary> /// <param name="hWnd">The h WND.</param> /// <param name="text">The text.</param> /// <returns></returns> [DllImport("user32.dll", CharSet = CharSet.Auto)] private static extern bool SetWindowText(IntPtr hWnd, string text); /// <summary> /// Sets the window pos. /// </summary> /// <param name="hWnd">The h WND.</param> /// <param name="hWndInsertAfter">The h WND insert after.</param> /// <param name="x">The x.</param> /// <param name="y">The y.</param> /// <param name="cx">The cx.</param> /// <param name="cy">The cy.</param> /// <param name="uFlags">The u flags.</param> /// <returns></returns> [DllImport("user32.dll", SetLastError = true)] [return: MarshalAs(UnmanagedType.Bool)] private static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int x, int y, int cx, int cy, uint uFlags); #endregion #region public constructor /// <summary> /// Initializes a new instance of the <see cref="ColorDialogExtension"/> class. /// </summary> /// <param name="x">The X position</param> /// <param name="y">The Y position</param> /// <param name="title">The title of the windows. If set to null(by default), the title will not be changed</param> public ColorDialogExtension(int x, int y, String title = null) { _x = x; _y = y; _title = title; } #endregion #region protected override methods /// <summary> /// Defines the common dialog box hook procedure that is overridden to add specific functionality to a common dialog box. /// </summary> /// <param name="hWnd">The handle to the dialog box window.</param> /// <param name="msg">The message being received.</param> /// <param name="wparam">Additional information about the message.</param> /// <param name="lparam">Additional information about the message.</param> /// <returns> /// A zero value if the default dialog box procedure processes the message; a nonzero value if the default dialog box procedure ignores the message. /// </returns> protected override IntPtr HookProc(IntPtr hWnd, int msg, IntPtr wparam, IntPtr lparam) { //We do the base initialization IntPtr hookProc = base.HookProc(hWnd, msg, wparam, lparam); //When we init the dialog if (msg == WM_INITDIALOG) { //We change the title if (!String.IsNullOrEmpty(_title)) { SetWindowText(hWnd, _title); } //We move the position SetWindowPos(hWnd, HWND_TOP, _x, _y, 0, 0, UFLAGS); } return hookProc; } #endregion }