Windows forms controls use ambient properties so child controls can appear like their surrounding environment Windows窗体控件使用环境属性，以便使子控件的外观接近于它们周围的环境。
If the control is not sited , the site does not support ambient properties , or the property is not set on the 属性查找环境属性的值。如果控件未设定位置，站点不支持环境属性，或者该属性未在
If the control is not sited , if the site does not support ambient properties , or if the property is not set on the 属性来确定环境属性的值。如果未放置控件，放置位置不支持环境属性，或者未在
If the control does not have a parent and the property is not set , the control tries to find the value of the ambient property through the 如果控件没有父控件，且属性也未设置，该控件尝试通过
