Objects for each state of the vertical scroll box also known as the thumb of a window Visualstyleelement . window . verticalthumb成员为窗口的垂直滚动框（也称为滚动块）的每种状态提供
Class methods that draw the scroll bar track , scroll box also known as the thumb , and scroll box grip 类方法的参数，该类的方法绘制滚动条轨道、滚动框（也称为滚动块）和滚动框手柄。
Objects for each state of the slider also known as the thumb of a vertical track bar Visualstyleelement . trackbar . thumbvertical成员为垂直跟踪条的滑块（也称为滚动块）的每种状态提供
Property is the number of positions the thumb moves in response to having the left or right arrow key pressed . the value of the >属性值是滚动块响应按下向左键或向右键时移动的位置数。
The address space of a modern pc is huge , and it would be easy to get lost by grabbing the scrollbar thumb and dragging it to a random location 如今的pc地址空间非常大，抓取滚动条滚动块并将其移动到任意位置，会很容易地丢失地址空间。
A " scroll box " ( or " thumb " ) travels the length of the scroll bar to indicate the approximate location of the material shown on the display in relation to the entire document “滚动块” （或“滑块” ）移动滚动条的长度以指出显示器上相对于整个文档显示的材料的大约位置。
Property is the number of positions the thumb moves in response to having the page up or page down key pressed , or in response to mouse clicks on the track bar on either side of the thumb 属性值是滚动块响应按下page up或page down键，或者响应鼠标在跟踪条上的滚动块任一边单击时所移动的位置数。
