Dev组合框控件ComboBoxEdit显示风格动态切换

使用场景：

界面中的ComboBoxEdit对应的数据来源可配置，可能是字符串类型，如城市名，也可能是数值类型，如手机号码。对于城市名时，通常会内置常用城市名，通过下拉框的形式，进行快速选择，而对于手机号码，则通常需要手动输入，使用下拉框的操作方式，体验并不好，需要根据数据来源，动态的切换效果。

处理方式：

 定义按钮：

private DevExpress.XtraEditors.Controls.EditorButton dropdownButtonProperty;

        private DevExpress.XtraEditors.Controls.EditorButton editButtonProperty;
        private DevExpress.Utils.SerializableAppearanceObject serializableAppearanceObject1;

创建：

            this.serializableAppearanceObject1 = new DevExpress.Utils.SerializableAppearanceObject();
            this.editButtonProperty = new DevExpress.XtraEditors.Controls.EditorButton(DevExpress.XtraEditors.Controls.ButtonPredefines.Glyph, "", -1, false, true, false, DevExpress.XtraEditors.ImageLocation.MiddleCenter, null, new DevExpress.Utils.KeyShortcut(System.Windows.Forms.Keys.None), this.serializableAppearanceObject1, "", null, null, true);
            this.dropdownButtonProperty = new DevExpress.XtraEditors.Controls.EditorButton(DevExpress.XtraEditors.Controls.ButtonPredefines.Combo);

使用：

if (a)            {
                               this.comboBoxEdit1.Properties.Buttons.Clear();
                this.comboBoxEdit1.Properties.Buttons.Add(this.dropdownButtonProperty);
            }
            else if (b)

            {                this.comboBoxEdit1.Properties.Buttons.Clear();
                this.comboBoxEdit1.Properties.Buttons.Add(this.editButtonProperty);
            }