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Public Class UserControl1
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#Region "变量"
Dim Down_Color As Color = Color.Blue
Dim UP_Color As Color = Color.Gray
Dim Mode As Short = 0
Dim flag As Boolean
Dim offset_X As Integer
Dim offset_Y As Integer
Dim Mouse_P As Point
#End Region
#Region "属性"
'按下颜色
Public Property _DownColor As Color
Get
Return Down_Color
End Get
Set(ByVal value As Color)
Down_Color = value
End Set
End Property
'弹起颜色
Public Property _UpColor As Color
Get
Return UP_Color
End Get
Set(ByVal value As Color)
UP_Color = value
End Set
End Property
'滑动模式 0-横 1-竖
Public Property _Mode As Short
Get
Return Mode
End Get
Set(ByVal value As Short)
Mode = value
End Set
End Property
#End Region
Private Sub UserControl1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Me.BackColor = UP_Color
End Sub
'鼠标按下
Private Sub UserControl1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseDown
Me.BackColor = Down_Color
Mouse_P = e.Location
flag = True
End Sub
'鼠标移动
Private Sub UserControl1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseMove
If flag = False Then Exit Sub
Select Case Mode
Case 0 '横向·
offset_X = e.X - Mouse_P.X
If Me.Location.X + offset_X + Me.Width = Me.ParentForm.Width Or Me.Location.X + offset_X = 0 Then
flag = False
Else
Me.Location = New Point(Me.Location.X + offset_X, Me.Location.Y)
End If
Case 1 '竖向·
offset_Y = e.Y - Mouse_P.Y
If Me.Location.Y + offset_Y + Me.Height + 30 = Me.ParentForm.Height Or Me.Location.Y + offset_Y = 0 Then
flag = False
Else
Me.Location = New Point(Me.Location.X, Me.Location.Y + offset_Y)
End If
End Select
End Sub
'鼠标弹起
Private Sub UserControl1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseUp
Me.BackColor = UP_Color
flag = False
End Sub
End Class
添加一个TextBox控件（比如叫TextBox1）。
类似于Lable控件的功能，你可以修改TextBox控件的Text属性来达到目的：
不是在设计器里修改，而是在代码中用“TextBox1.Text="你想要显示的字符串";”这样的语句，这样就可以在程序运行时改变显示的内容。
设置或者取消星号，你可以通过代码修改TextBox1的PasswordChar属性，跟上面的是类似的：
在其他的控件的事件中比如Button的Click事件中修改——“TextBox1.PasswordChar="";//不显示***”
“TextBox1.PasswordChar="*（或者任何你想要的字符）";//显示为***”
至于什么时候改就完全随你的意思了。
Public Class 用户控件
Inherits System.Windows.Forms.Panel
Public Sub New() '初始化
End Sub
Private Sub 用户控件_KeyDown(sender As Object, e As Forms.KeyEventArgs) Handles Me.KeyDown
' ……
End Sub
'……
End Class
mytest1是继承自什么类，通常应该继承自UerControl，虽然你这样也能编译通过，但实际上没有任何意义。所以你先改了再说。继承之后，编译，工具箱就会多这么个控件，拖动到Form1上，这样按钮下就不用再new了。然后你再来问。