占位符。由树形网格控件代替。
这些控件之一是指定为占位符控件。
One of these controls is designated as a placeholder control.
子母版页通常会包含一些内容控件，这些控件将映射到父母版页上的内容占位符。
The child master page typically contains content controls that are mapped to content placeholders on the parent master page.
子母版页通常会包含一些内容控件，这些控件将映射到父母版页上的内容占位符。
The child master page typically contains content controls that are mapped to content placeholders on the parent master page.
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