求助walk 做gui界面的问题

var lab *walk.Label

var text *walk.TextEdit

var txt *walk.LineEdit

var button *walk.PushButton

mw := new(MyMainWindow)

if err := (MainWindow{
    AssignTo: &mw.MainWindow,    
    Title:    "通讯服务器",
    MinSize:  Size{500, 600},
    Layout:   VBox{},
    Children: []Widget{
        Label{
            AssignTo: &lab,
            Text:     "监听端口",
        },
        LineEdit{
            AssignTo: &txt,
        },
        PushButton{
            AssignTo: &button,
            Text:     "保存",
            OnClicked: func() {
                str := "[service]" + "\r\n"
                str = str + "SocketPort=" + txt.Text()
                file, _ := os.Create(fpath)
                w := bufio.NewWriter(file)
                w.WriteString(str)
                w.Flush()
                file.Close()
                var hwnd winapi.HWND
                winapi.MessageBox(hwnd, Text("保存成功请重启生效"), Text("提示"), winapi.MB_OK)
            },
        },
        TextEdit{
            AssignTo: &text,
        },
    },
}.Create()); err != nil {
    _, _, line, _ := runtime.Caller(0)
    logPrintln(line, err.Error())
}
lab.SetBounds(walk.Rectangle{10, 10, 50, 20})
txt.SetBounds(walk.Rectangle{70, 10, 100, 20})
button.SetBounds(walk.Rectangle{190, 10, 80, 20})
text.SetBounds(walk.Rectangle{15, 60, 465, 490})

这种情况下 运行的时候可以正常显示 如果最小化之后 控件就不能到指定的位置了

求教啊