System.Windows.Forms.ToolBarButton.GetTBBUTTONINFO C# (CSharp) Method

        internal NativeMethods.TBBUTTONINFO GetTBBUTTONINFO(bool updateText, int newCommandId) {

            NativeMethods.TBBUTTONINFO button = new NativeMethods.TBBUTTONINFO();
            button.cbSize = Marshal.SizeOf(typeof(NativeMethods.TBBUTTONINFO));
            button.dwMask = NativeMethods.TBIF_IMAGE
                            | NativeMethods.TBIF_STATE | NativeMethods.TBIF_STYLE;

            // Comctl on Win98 interprets null strings as empty strings, which forces
            // the button to leave space for text.  The only workaround is to avoid having comctl 
            // update the text.
            if (updateText) {
                button.dwMask |= NativeMethods.TBIF_TEXT;
            }

            button.iImage = ImageIndexer.ActualIndex;

            if (newCommandId != commandId) {
                commandId = newCommandId;
                button.idCommand = newCommandId;
                button.dwMask |= NativeMethods.TBIF_COMMAND;
            }

            // set up the state of the button
            //
            button.fsState = 0;
            if (enabled) button.fsState |= NativeMethods.TBSTATE_ENABLED;
            if (partialPush && style == ToolBarButtonStyle.ToggleButton) button.fsState |= NativeMethods.TBSTATE_INDETERMINATE;
            if (pushed) button.fsState |= NativeMethods.TBSTATE_CHECKED;
            if (!visible) button.fsState |= NativeMethods.TBSTATE_HIDDEN;

            // set the button style
            //
            switch (style) {
                case ToolBarButtonStyle.PushButton:
                    button.fsStyle = NativeMethods.TBSTYLE_BUTTON;
                    break;
                case ToolBarButtonStyle.ToggleButton:
                    button.fsStyle = NativeMethods.TBSTYLE_CHECK;
                    break;
                case ToolBarButtonStyle.Separator:
                    button.fsStyle = NativeMethods.TBSTYLE_SEP;
                    break;
            }


            if (text == null) {
                button.pszText = Marshal.StringToHGlobalAuto("\0\0");
            }
            else {
                string textValue = this.text;
                PrefixAmpersands(ref textValue);
                button.pszText = Marshal.StringToHGlobalAuto(textValue);
            }

            return button;
        }
        

        /// <include file='doc\ToolBar.uex' path='docs/doc[@for="ToolBar.InternalSetButton"]/*' />
        /// <devdoc>
        ///     Changes the data for a button in the ToolBar, and then does the appropriate
        ///     work to update the ToolBar control.
        /// </devdoc>
        /// <internalonly/>
        internal void InternalSetButton(int index, ToolBarButton value, bool recreate, bool updateText) {

            // tragically, there doesn't appear to be a way to remove the
            // string for the button if it has one, so we just have to leave
            // it in there.
            //
            buttons[index].parent = null;
            buttons[index].stringIndex = (IntPtr)(-1);
            buttons[index] = value;
            buttons[index].parent = this;

            if (IsHandleCreated) {
                NativeMethods.TBBUTTONINFO tbbi = value.GetTBBUTTONINFO(updateText, index);
                UnsafeNativeMethods.SendMessage(new HandleRef(this, Handle), NativeMethods.TB_SETBUTTONINFO, index, ref tbbi);

                if (tbbi.pszText != IntPtr.Zero) {
                    Marshal.FreeHGlobal(tbbi.pszText);
                }

                if (recreate) {
                    UpdateButtons();
                }
                else {
                    // after doing anything with the comctl ToolBar control, this
                    // appears to be a good idea.
                    //
                    SendMessage(NativeMethods.TB_AUTOSIZE, 0, 0);

                    ForceButtonWidths();
                    this.Invalidate();
                }
            }
        }