DefaultNewCellStyle is a notebook option which specifies the default style to use for new cells created in the notebook.
Deletable is an option for Cell that specifies whether the cell can be deleted interactively using the front end.
GridDefaultElement is an option for the low-level function GridBox that specifies what to insert when a new element is created interactively in a GridBox.
LineBreakChart[{{date_1, p_1}, {date_2, p_2}, ...}] makes a line break chart with prices p_i at date date_i.LineBreakChart[{" name", daterange}] makes a line break chart of ...
Widget["Button"] represents a button.
Widget["CheckBox"] represents a checkbox.
Edit Stylesheet edits the style definitions for the current notebook.
CellGroupData[{cell_1, cell_2, ...}] is a low-level construct that represents an open group of cells in a notebook. CellGroupData[{cell_1, cell_2, ...}, 1] represents a cell ...
InputAssumptions is an option for WolframAlpha that specifies assumptions for current query input.
MessageDialog[expr] puts up a standard message dialog that displays expr together with an OK button.MessageDialog[expr, {lbl_1 :> act_1, lbl_2 :> act_2, ...}] includes ...