Class TCustomBoundaryItem

	`procedure SetStartTime(const Value: double);`
	`procedure AssignObserverEvents(Collection: TCollection); virtual; abstract;`
	`procedure CreateFormulaObjects; virtual; abstract;`
	`procedure GetPropertyObserver(Sender: TObject; List: TList); virtual; abstract;`
	`procedure RemoveFormulaObjects; virtual; abstract;`
	`function GetScreenObject: TObject;`
	`procedure ResetItemObserver(Index: integer);`
	`procedure UpdateFormulaDependencies(OldFormula: string; var NewFormula: string; Observer: TObserver; Compiler: TRbwParser);`
	`function GetBoundaryFormula(Index: integer): string; virtual; abstract;`
	`procedure SetBoundaryFormula(Index: integer; const Value: string); virtual; abstract;`
	`function IsSame(AnotherItem: TOrderedItem): boolean; override;`
	`function BoundaryFormulaCount: integer; virtual; abstract;`
	`function NonBlankFormulas: boolean;`
	`procedure UpdateFormula(Value: string; Position: Integer; var FormulaObject: TFormulaObject);`
	`procedure RemoveSubscription(Sender: TObject; const AName: string);`
	`procedure RestoreSubscription(Sender: TObject; const AName: string);`
	`function CreateFormulaObject(Orientation: TDataSetOrientation): TFormulaObject; virtual;`
	`procedure Assign(Source: TPersistent); override;`
	`constructor Create(Collection: TCollection); override;`
	`destructor Destroy; override;`

	`property ScreenObject: TObject read GetScreenObject;`
	`property BoundaryFormula[Index:integer]: string read GetBoundaryFormula write SetBoundaryFormula;`
	`property StartTime: double read FStartTime write SetStartTime;`

Description

	`FStartTime: double;`
See StartTime.

	`FObserverList: TList;`

	`procedure SetStartTime(const Value: double);`
See StartTime.

	`procedure AssignObserverEvents(Collection: TCollection); virtual; abstract;`

	`procedure CreateFormulaObjects; virtual; abstract;`

	`procedure GetPropertyObserver(Sender: TObject; List: TList); virtual; abstract;`

	`procedure RemoveFormulaObjects; virtual; abstract;`

	`function GetScreenObject: TObject;`

	`procedure ResetItemObserver(Index: integer);`

	`procedure UpdateFormulaDependencies(OldFormula: string; var NewFormula: string; Observer: TObserver; Compiler: TRbwParser);`

	`function GetBoundaryFormula(Index: integer): string; virtual; abstract;`
See BoundaryFormula.

	`procedure SetBoundaryFormula(Index: integer; const Value: string); virtual; abstract;`
See BoundaryFormula.

	`function IsSame(AnotherItem: TOrderedItem): boolean; override;`
`IsSame` returns `True` if AnotherItem is a `TCustomBoundaryItem` and StartTime is the same in the current `TCustomBoundaryItem` and in AnotherItem.

	`function BoundaryFormulaCount: integer; virtual; abstract;`

	`function NonBlankFormulas: boolean;`

	`procedure UpdateFormula(Value: string; Position: Integer; var FormulaObject: TFormulaObject);`

	`procedure RemoveSubscription(Sender: TObject; const AName: string);`

	`procedure RestoreSubscription(Sender: TObject; const AName: string);`

	`function CreateFormulaObject(Orientation: TDataSetOrientation): TFormulaObject; virtual;`

	`procedure Assign(Source: TPersistent); override;`

	`constructor Create(Collection: TCollection); override;`

	`destructor Destroy; override;`

	`property ScreenObject: TObject read GetScreenObject;`

property BoundaryFormula[Index:integer]: string read GetBoundaryFormula write SetBoundaryFormula;

Descendants of TCustomBoundaryItem define string properties that are the formulas for the unique features of each boundary condition. BoundaryFormula provides access to those properties without knowing what they are through the virtual abstract methods GetBoundaryFormula and SetBoundaryFormula. Descendants must override those methods. BoundaryFormula is used in TfrmScreenObjectProperties.StoreModflowBoundary and TfrmScreenObjectProperties.GetModflowBoundary.

	`property StartTime: double read FStartTime write SetStartTime;`
`StartTime` indicates the starting time of this boundary.