C# listbox

起名什么的很麻烦 2016-11-18 11:17:33

如图控件listbox 我点击右下角的按钮时,触发的是什么事件,click没反应 SelectedIndexChanged也没反应.
哪位大神解释下啊

// Horizontal_LB

            // 

            this.Horizontal_LB.Font = new System.Drawing.Font("宋体", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));

            this.Horizontal_LB.FormattingEnabled = true;

            this.Horizontal_LB.ItemHeight = 16;

            this.Horizontal_LB.Items.AddRange(new object[] {

            "0.05 ms/div",

            "0.1 ms/div",

            "0.2 ms/div",

            "0.5 ms/div",

            "1 ms/div",

            "2 ms/div",

            "5 ms/div",

            "10 ms/div",

            "20 ms/div",

            "50 ms/div",

            "0.1 sec/div",

            "0.2 sec/div",

            "0.5 sec/div",

            "1 sec/div",

            "2 sec/div",

            "5 sec/div",

            "10 sec/div"});

            this.Horizontal_LB.Location = new System.Drawing.Point(393, 277);

            this.Horizontal_LB.Name = "Horizontal_LB";

            this.Horizontal_LB.Size = new System.Drawing.Size(113, 20);

            this.Horizontal_LB.TabIndex = 92;