# Calculated widget properties
Some widget properties can be defined by formula. Here, the most important property is the content of a widget, which can be either entered manually during the Edit mode, or can be calculated by a formula.
The content of the cell widget is calculated by the RAND function.
Besides the content, there are several other properties which can be calculated during a session, like Visible, Style or Connection. This provides the Editor with enhanced capabilities to dynamically customize the user interface and functionality of an app.
If a property of a widget is calculated, the following principles are followed:
* A new calculation of a property replaces the previous value(s) of the property completely.
* If the calculation formula of a property returns *empty*, the property value(s) are not changed.
* When a value of a widget on which the property directly or indirectly depends changes, the formula of the property is recalculated.
* Calculated properties have different dimensionality. There are properties like *Content* or Editable, which can be a multi-cell range, or a property *Visible* or *Style*, containing always only one cell.
In the following chapters, these properties are described in detail.
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