Tomado de la ayuda de delphi
Cita:
Determines how the control aligns within its container (parent control).
property Align: TAlign;
Description
Use Align to align a control to the top, bottom, left, or right of a form or panel and have it remain there even if the size of the form, panel, or component that contains the control changes. When the parent is resized, an aligned control also resizes so that it continues to span the top, bottom, left, or right edge of the parent.
For example, to use a panel component with various controls on it as a tool palette, change the panel’s Align value to alLeft. The value of alLeft for the Align property of the panel guarantees that the tool palette remains on the left side of the form and always equals the client height of the form.
The default value of Align is alNone, which means a control remains where it is positioned on a form or panel.
Tip: If Align is set to alClient, the control fills the entire client area so that it is impossible to select the parent form by clicking on it. In this case, select the parent by selecting the control on the form and pressing Esc, or by using the Object Inspector.
Any number of child components within a single parent can have the same Align value, in which case they stack up along the edge of the parent. The child controls stack up in z-order. To adjust the order in which the controls stack up, drag the controls into their desired positions.
Note: To cause a control to maintain a specified relationship with an edge of its parent, but not necessarily lie along one edge of the parent, use the Anchors property instead.
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Pues yo tambien he quedado intrigado, y alli les pego la ayuda de delphi sobre la propiedad align, no dice nada al respecto
Cita:
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En tiempo de diseño puse align:=alClient al TPageControl para que no quede desproporcionado cuando se maximiza el Form
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Ese si es el problema, Si el padre no se redimensiona no esperes que el hijo lo haga