TransferFunctionPoles[tf] gives a matrix of roots of the denominators in the TransferFunctionModel object tf.
Setting
(Built-in Mathematica Symbol) Setting[expr] replaces control objects such as sliders or popup menus in expr by their settings.
Manipulate Introduction to Control Objects Views
ImageSize is an option that specifies the overall size of an image to display for an object.
FieldSize is an option for InputField, PopupMenu, and related functions that specifies the size of the field allowed for input or contents.
Interpretation[e, expr] represents an object that displays as e, but is interpreted as the unevaluated form of expr if supplied as input. Interpretation[{x = x_0, y = y_0, ...
Palettes can be configured to remember their previous states across front end sessions. This is useful for palettes containing multiple expandable sections, tab views, ...
AutoAction is an option for objects such as Slider, Locator, and Button that specifies whether they should automatically take action whenever the mouse pointer is over them, ...
Mathematica's unified symbolic architecture makes it straightforward to add toolbars with any possible appearance and action to any Mathematica notebook.
SetterBar[x, {val_1, val_2, ...}] represents a setter bar with setting x and with setter buttons for values val_i.SetterBar[Dynamic[x], {val_1, val_2, ...}] takes the setting ...